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Thermal and electrochemical performance assessment of a high temperature PEM electrolyzer

Author

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  • Toghyani, S.
  • Afshari, E.
  • Baniasadi, E.
  • Atyabi, S.A.
  • Naterer, G.F.

Abstract

In this paper, detailed effects of operating conditions and design parameters including temperature, pressure, gas diffusion layer (GDL) thickness, membrane thickness and GDL porosity on the performance of a high temperature proton exchange membrane electrolyzer cell (PEMEC) are studied. A CFD analysis is carried out using a finite volume method based on a fully three-dimensional model. The model is verified against experimental data and the realistic effects of varying operating conditions are considered. The results indicate that decrease of operating temperature from 403 K to 373 K results in reduction of hydrogen concentration at the membrane-catalyst interface from 2.2 × 10−4 to 1.9 × 10−4 mol/m3. The temperature and hydrogen concentration under rib area of channel are relatively higher due to the accumulation of water under this area that leads to higher electrochemical rate. An increase of GDL thickness from 0.2 mm to 0.5 mm at a voltage of 1.65 V leads to reduction of current density from 0.426 A/cm2 to 0.409 A/cm2. The porosity of the GDL has no significant effect on the polarization curve. The current density of the PEMEC for a membrane thickness of 50μm at voltage of 1.6 V is 48% higher than a membrane thickness of 200μm.

Suggested Citation

  • Toghyani, S. & Afshari, E. & Baniasadi, E. & Atyabi, S.A. & Naterer, G.F., 2018. "Thermal and electrochemical performance assessment of a high temperature PEM electrolyzer," Energy, Elsevier, vol. 152(C), pages 237-246.
    • Handle: RePEc:eee:energy:v:152:y:2018:i:c:p:237-246
    DOI: 10.1016/j.energy.2018.03.140
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    References listed on IDEAS

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